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DIY Cost Tools

DIY Cost Tools

Pond Liner Size Calculator

Estimate one-piece liner dimensions for a rectangular pond from footprint, depth, and edge overlap.

Number from 1 to 500 ft.
Number from 1 to 500 ft.
Number from 0 to 100 ft.
Number from 0 to 20 ft.
Number from 0 to 100 %.

Enter values in the units shown. Empty fields, fractions, comma-formatted numbers, values outside the listed ranges, and non-finite values are rejected.

Liner length
Liner width
Sheet area

How to use this calculator

  1. Measure the project or enter costs from a current quote or product label.
  2. Adjust the quantities, coverage, package size, and allowances to match your situation.
  3. Select Calculate, then check the method, worked example, and limitations below.

Formula and method

Liner length = pond length + twice the depth + twice the overlap. Width follows the same rule. Sheet area = length × width × (1 + allowance%).

Whole packages and pieces are rounded up. Results disappear when an input changes until the new values are calculated.

Worked example

Pond length 12 ft; Pond width 8 ft; Maximum depth 3 ft; Edge overlap per side 1.5 ft; Extra allowance 10 %. Results: Liner length 21 ft; Liner width 17 ft; Sheet area 392.7 sq ft.

The example uses the values initially displayed in the fields.

Limitations

Check the actual excavation profile, shelves, pleats, folds, roll width, seams, and manufacturer overlap guidance.

Review and reference

Reviewed October 5, 2026. The default example, input boundaries, arithmetic, rounding, and invalid input behavior were checked. The method is explained on How Our Calculators Work; replace example inputs with measurements or current product specifications. This is a planning estimate.

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